Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b6ac05a5b0cb309…

MALICIOUS

PDF

72.4 KB Created: 2021-09-19 02:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5bcd744a2e9056f90091e7d1158c3380 SHA-1: c2a1b734590d056fc480eef304b3255c35807177 SHA-256: 1b6ac05a5b0cb309504531bb96b7be610897b9556af839311feef9381e3a7cd2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also exhibits characteristics of a link farm, with numerous external URIs pointing to disposable hosting. The primary purpose appears to be directing users to a network of potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://aranysolyomfeszke.hu/editor_up/nijamidobedazefete.pdf
    • http://camberwelltaxi.com/survey/userfiles/files/1336842593.pdf
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/vosofuzexavisavovufo.pdf
    • https://songod.vn/uploads/image/files/momokolam.pdf
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/96389546257.pdf
    • https://habibitours.net/ckfinder/userfiles/files/49116064742.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/bexogedimevebojefukosuj.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16134865666a52---46874817446.pdf
    • http://xn--b1akwe.xn--p1ai/userfiles/file/54648471279.pdf
    • http://rs-entp.com/upload/file/fotigonuxewidil.pdf
    • http://onlineticketreview.com/images/file/3465883165.pdf
    • http://matsonconstruction.net/userfiles/file/dikimazamugaz.pdf
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/25042058863.pdf
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/damotevasowegiwa.pdf
    • https://expobar.vn/app/webroot/files/images/pages/files/demasipuzemodef.pdf
    • http://parvazyab.net/basefile/api203/files/42273898012.pdf
    • http://maybaobidinhdinh.com/upload/files/32938279897.pdf
    • http://m-styleauto.com/js/upload/files/61712956429.pdf
    • http://vidol.nl/userfiles/file/pezixe.pdf
    • https://haidangpc.com/contents/files/xesusugumokazadox.pdf
    • http://hdg-gmuend.de/userfiles/files/82502559597.pdf
    • http://3bbb.fr/ckeditor/upload/files/nulasuripinejubeka.pdf
    • https://fullmagicweekend.com/ckfinder/userfiles/files/52541919414.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=c%2B%2B+primer+lippman+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7AC 16792 bytes
font_01_sfnt_off0000cfbe.bin
3709dd813dc6ef774d8d02a3d900d64f3405c5110e2804c5389888199566eacf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBE 17716 bytes
font_02_sfnt_off0000fd58.bin
44680355f4eb7644dd52532c4e1be9303f08c014375250cba8be7d95b845c5da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD58 10304 bytes

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